1 files changed, 236 insertions, 0 deletions
diff --git a/fluent-bit/lib/cfl/src/cfl_sds.c b/fluent-bit/lib/cfl/src/cfl_sds.c
new file mode 100644
index 00000000..eff66fe3
--- /dev/null
+++ b/fluent-bit/lib/cfl/src/cfl_sds.c
@@ -0,0 +1,236 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  CFL
+ *  ===
+ *  Copyright (C) 2022 The CFL Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/*
+ * This interface is a minimized version of Fluent Bit SDS just for easily
+ * string storage
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <inttypes.h>
+
+#include <cfl/cfl_sds.h>
+
+size_t cfl_sds_avail(cfl_sds_t s)
+{
+    struct cfl_sds *h;
+
+    h = CFL_SDS_HEADER(s);
+    return (size_t) (h->alloc - h->len);
+}
+
+cfl_sds_t sds_alloc(size_t size)
+{
+    void *buf;
+    cfl_sds_t s;
+    struct cfl_sds *head;
+
+    buf = malloc(CFL_SDS_HEADER_SIZE + size + 1);
+    if (!buf) {
+        return NULL;
+    }
+
+    head = buf;
+    head->len = 0;
+    head->alloc = size;
+
+    s = head->buf;
+    *s = '\0';
+
+    return s;
+}
+
+size_t cfl_sds_alloc(cfl_sds_t s)
+{
+    return (size_t) CFL_SDS_HEADER(s)->alloc;
+}
+
+cfl_sds_t cfl_sds_increase(cfl_sds_t s, size_t len)
+{
+    size_t new_size;
+    struct cfl_sds *head;
+    cfl_sds_t out;
+    void *tmp;
+
+    out = s;
+    new_size = (CFL_SDS_HEADER_SIZE + cfl_sds_alloc(s) + len + 1);
+    head = CFL_SDS_HEADER(s);
+    tmp = realloc(head, new_size);
+    if (!tmp) {
+        return NULL;
+    }
+    head = (struct cfl_sds *) tmp;
+    head->alloc += len;
+    out = head->buf;
+
+    return out;
+}
+
+size_t cfl_sds_len(cfl_sds_t s)
+{
+    return (size_t) CFL_SDS_HEADER(s)->len;
+}
+
+cfl_sds_t cfl_sds_create_len(const char *str, int len)
+{
+    cfl_sds_t s;
+    struct cfl_sds *head;
+
+    s = sds_alloc(len);
+    if (!s) {
+        return NULL;
+    }
+
+    if (str) {
+        memcpy(s, str, len);
+        s[len] = '\0';
+
+        head = CFL_SDS_HEADER(s);
+        head->len = len;
+    }
+    return s;
+}
+
+cfl_sds_t cfl_sds_create(const char *str)
+{
+    size_t len;
+
+    if (!str) {
+        len = 0;
+    }
+    else {
+        len = strlen(str);
+    }
+
+    return cfl_sds_create_len(str, len);
+}
+
+void cfl_sds_destroy(cfl_sds_t s)
+{
+    struct cfl_sds *head;
+
+    if (!s) {
+        return;
+    }
+
+    head = CFL_SDS_HEADER(s);
+    free(head);
+}
+
+cfl_sds_t cfl_sds_cat(cfl_sds_t s, const char *str, int len)
+{
+    size_t avail;
+    struct cfl_sds *head;
+    cfl_sds_t tmp = NULL;
+
+    avail = cfl_sds_avail(s);
+    if (avail < len) {
+        tmp = cfl_sds_increase(s, len);
+        if (!tmp) {
+            return NULL;
+        }
+        s = tmp;
+    }
+    memcpy((char *) (s + cfl_sds_len(s)), str, len);
+
+    head = CFL_SDS_HEADER(s);
+    head->len += len;
+    s[head->len] = '\0';
+
+    return s;
+}
+
+cfl_sds_t cfl_sds_create_size(size_t size)
+{
+    return sds_alloc(size);
+}
+
+void cfl_sds_set_len(cfl_sds_t s, size_t len)
+{
+    struct cfl_sds *head;
+
+    head = CFL_SDS_HEADER(s);
+    head->len = len;
+}
+
+void cfl_sds_cat_safe(cfl_sds_t *buf, const char *str, int len)
+{
+    cfl_sds_t tmp;
+
+    tmp = cfl_sds_cat(*buf, str, len);
+    if (!tmp) {
+        return;
+    }
+    *buf = tmp;
+}
+
+cfl_sds_t cfl_sds_printf(cfl_sds_t *sds, const char *fmt, ...)
+{
+    va_list ap;
+    int len = strlen(fmt)*2;
+    int size;
+    cfl_sds_t tmp = NULL;
+    cfl_sds_t s;
+    struct cfl_sds *head;
+
+    if (len < 64) len = 64;
+
+    s = *sds;
+    if (cfl_sds_avail(s)< len) {
+        tmp = cfl_sds_increase(s, len);
+        if (!tmp) {
+            return NULL;
+        }
+        *sds = s = tmp;
+    }
+
+    va_start(ap, fmt);
+    size = vsnprintf((char *) (s + cfl_sds_len(s)), cfl_sds_avail(s), fmt, ap);
+    if (size < 0) {
+        va_end(ap);
+        return NULL;
+    }
+    va_end(ap);
+
+    if (size >= cfl_sds_avail(s)) {
+        tmp = cfl_sds_increase(s, size - cfl_sds_avail(s) + 1);
+        if (!tmp) {
+            return NULL;
+        }
+        *sds = s = tmp;
+
+        va_start(ap, fmt);
+        size = vsnprintf((char *) (s + cfl_sds_len(s)), cfl_sds_avail(s), fmt, ap);
+        if (size > cfl_sds_avail(s)) {
+            va_end(ap);
+            return NULL;
+        }
+        va_end(ap);
+    }
+
+    head = CFL_SDS_HEADER(s);
+    head->len += size;
+    s[head->len] = '\0';
+
+    return s;
+}
+